I'm such an idiot, in daylight I can clearly see that the RCAs are for 'component av in'. I'm off to get an optical cable.
Just replaced old Samsung TV and bought sound bar too, but can't get sound out of TV RCA audio output to sound bar. Am using humax HDR-FOX T2 for tuner (Hdmi connection). If I connect Rca cables supplied with soundbar to humax, sound bar works, but I want the sound bar to be able to output sound from TV, DVD and hard drive all connected to TV.
Have tried switching to external speakers in TV menu, but no joy. Must be something obvious right? Any reason optical cable would work but not RCA? (I don't have optical to hand)